Bike-on-Bike
Default Config
XL
No Diagram
Default Config
Insights
Average stack and reach vs trend of all-road/gravel bikes
Design deviates from other sizes of Serk Titanium A21
Very upright stack and reach vs trend of progressive gravel bikes
Design deviates from other sizes of LightCarbon LCG072-D
Geometry
Stack | 597mm | 604.9mm +7.9mm |
Reach | 390mm | 393mm +3mm |
Stack to Reach Ratio | 1.53:1 | 1.54:1 |
Seat Tube Length, C-T | 535mm | — |
Seat Tube Length, Effective Unknown | — | 536mm |
Top Tube Length, Effective/Horizontal Center | — | 566.6mm |
Top Tube Length, Effective/Horizontal HT Top | 569mm | — |
Top Tube Slope | 8.8deg | — |
Head Tube Angle | 70deg | 71.5deg +1.5deg |
Seat Tube Angle | 73.5deg | 74deg +0.5deg |
Head Tube Length | 164mm | 192mm +28mm |
Bottom Bracket Drop | 73mm | 76mm +3mm |
Bottom Bracket Height | 266mm | 285mm +19mm |
Chainstay Length | 430mm | 420mm -10mm |
Chainstay Length Horizontal | 423.8mm | 413.1mm -10.7mm |
Front-Center | 633mm | 628.9mm -4.1mm |
Front-Center Horizontal | 628.2mm | 627.3mm -0.9mm |
Wheelbase | 1052mm | 1040.4mm -11.6mm |
Fork Offset/Rake | 45mm | 51.5mm +6.5mm |
Fork Length (On-Axis) | — | 383mm |
Trail | 75.5mm high | 66.5mm -9mm high |
Mechanical Trail | 70.9mm | 63.1mm -7.8mm |
Wheel Flop | 24.3mm | 20mm -4.3mm |
Standover Height | — | 828mm |
Tire to Pedal Spindle | 124mm 170 mm cranks | 97.9mm -26.1mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 96mm 170 mm cranks | 115mm +19mm 170 mm cranks |
Build
Wheel Size | 650B/27.5 in 584 mm BSD | 700C/29 in 622 mm BSD |
Tire Width | 47mm | 50mm +3mm |
Tire Outer Diameter | 678mm | 722mm +44mm |
Bike Length with Tires | 1730mm | 1762.4mm +32.4mm |
| Suspension Type | Rigid, non-suspension corrected | Rigid, non-suspension corrected |
| Bar Type | Drop Bar | Drop Bar |
| Frame Material | Titanium | Carbon/Composite |
| Fork Material | Carbon/Composite | Carbon/Composite |
| Brake Type | Disc | Disc |
Meta
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| Source | https://www.serk.cc/a21/ | https://de.lightcarbon.com/uploadfile/downloads/2026-2027%20LightCarbon%20Frame+Component%20Catalog%20-V1.pdf |
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